There are 16 words that start with 'extin'.
| extinct | extincts |
| extincted | extincting |
| extinction | extinctive |
| extinguish | extinctions |
| extinguished | extinguisher |
| extinguishes | extinguishers |
| extinguishing | extinguishable |
| extinguishment | extinguishments |
Note: These 16 words that start with 'extin' are found from the USA & Canada version of the tournament Scrabble word list.